Kingwin's XT-1264 is the first tower-style heatsink to pass through the Frostytech test labs which incorporates asymmetrical "U" shaped heatpipes. In other words the heatpipes are not even, rather one length of each vertical heatpipe is 30mm shorter than the opposite.

FULL STORY @ FROSTYTECH(http://www.frostytech.com/articleview.cfm?articleID=2420)